# 523

This number is a prime.

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The smallest prime formed by concatenating Honaker triplets. [Loungrides]

The smallest prime formed by concatenating three distinct consecutive Fibonacci primes, i.e., 2, 3, 5. [Loungrides]

The smallest prime formed from two adjacent primes with their difference inserted between them. [Loungrides]

The only distinct-digit prime-digit prime that is a sum of mountain primes, i.e., 523=151+181+191. [Loungrides]

The smallest prime-digit prime that is the sum of three consecutive primes in the sequence of prime-digit primes, i.e., 73+223+227=523. [Loungrides]

The only distinct-digit prime-digit prime that can be represented as sum of successive mountain primes, i.e., 151+181+191. [Loungrides]

The smallest prime of the form x^x+n, where x is a positive integer and n a perfect number, i.e., 3^3+496. [Loungrides]

The only prime-digit prime that can be represented as sum of two successive narcissistic numbers, i.e., 153+370. [Loungrides]

The ordered concatenation of the 3-digit prime-digit primes, without 523, is prime. [Loungrides]